Mortise lock



F. LUTZMANN.

MORTISE LOCK.

APPLICATION FILED DEC.16, 1920.

1 433 31 Patented 00% 31, 19252.

5 l///llIIlI/II Patented @ct. Lil, lfilli l.

more es FRIEDRICH norzlimnn, onsnslon, SWITZERLAND.nssrelvon T0 Jenn B.sunceznnn, or ZURICH, SWITZERLAND monrisn noon.

,nhpplication filed December s, 1920. semi 1%. 431,258.

1'0 (416 w/mm. it may concern Be it known that I, Fnninnion LUTZMANN, acitizen of the German Republic, residing at Zurich, Switzerlend,'Stamptenbachstresse No. 48. have invented new and useful lin-].)i(.)\i1'il( l1l5 in u .llloitise Lock (for. which i have tiledapplication for patent in Germany, ()ctol; er 18, 1.910). oil which thefol.- lor-king is e specification;

The present invention relates to a new and improved mortise loci; havingit boltrotutn hl v mounted, .ithin thelocliuse adopted to be actuatedagainst the action of c spring In knobs. bundles or the like. I

Unc object of the invention is to provide :1 lock of the hind describedin whichthe bolt may be secured in its locking position either bf, 21key-operated tumbler or by :1 hand. actuated stop.

A further object consists in the provision of means to prevent thelocking of the bolt by the lrevnctuuted tumbler ii and as long as thesaid bolt is locked by the hand stop. The lock cannot be actuated blvthe key say from the outside oi a room if the bolt has been locked bythe stop which can only be actuated from the inside of the room. i 4

A. still further ob ect consists in the pro- 'l l *ll hlll 'l tr .ision()1 1. or r, n no 1 s a )e snnp e, on

end durable in construction and adapted to be used for any cit-her rightor left hand door.

I attain the lust named object by iori'ning the operative parts of thelock from strong sheet mete] placing the same one beside the other inthe case. all being arranged in one plane in such a manner that the lockcase is very thin and needs only a narrow mortise in the wooden doorstyle.

ithe]? objects of the invention relate to the provision oi? minor partscooperating with the elements above noted and to details of constructionall of which. will. be more clearly set forth in the followingspecification.

With the above objects in view the invention resides in the parts andcombinations of ports hereinafter descrlbed, and particuunderstood ithave illustrated the same in the accompanying drawings, wherein:

set

. 8 the bolt isrotated.

hi 1. is :1. side elevation of the lock :1 side plgite of the lock casebeing removed, the bolt lJQlilg shownin. locked position.

Fig. Qis a section on line A.

Fig; 3 shows the face plate of the lock.

l lgS. 4t and show the strike plete of the lock cooperating with thebolt.

The lock shown in the drawing comprises u case 1 one part being stampedand pressed iti oni sheet metal which part is covered by a plate takenotf in Figs. '1 and 2). in the \vnlls ojll the case 1 2L pin 2 flied onwhich the bolt 3 is i'oteteblv mounted. provided with :1 head 4-proiecting'through deepening in the face plate 5 ofthe case 1 siiid heedat being adapted to engage the strike 21 fixed to the door frame.Against the bolt 3 shuts one end of spring 6 the other end of whichrests on an arm 7 of a hub 8 rotntnbllv mounted in the side walls of thelock case. The hubS which is provided with u squared hole to receive thespindle on which the knobs (not shown in the drawing) are fixed,provided with a tooth 9 which in engagementwith an arm 10 of bolt 3 insuch a manner that on rotation of the hub to keep the bolt 23in theposition shown in the face plate 5. /Vith the arm 10 cooperetes a toothl? of a second hub 16 journalled in the side walls of the case 1 adaptedto receive 21- spindle with squere cross-section on which a knob 25 isfixed. The hubs 8 and 16 corresponding in shape and in size areinterchangeable. Between the boss 16 and the front wall of the case 1there is a blade spring: 18 which is under tension and which tends tohold the boss either in the position shown in Fig. 1 in. full lines orin that shown in Fig. .1 in dotted lines. the position shown in Fig. 1in full lines the teeth 1? acts as a stop for the arm 10 and makes itimpossible to turn bolt by the toothl). On a pin 12 a tumbler 11 is roJtatably mounted which can be moved by e,

key inserted through the keyhole 14 from the position shown in fulllines in Fig. 1 to that shown in dotted lines and vice-verse against theaction of a spring 13. The one free end of the tumbler 11 is adapted tobe brought in engagement with the bolt 3 and to serve a locking elementwhich abutting;

of Fig. 1..

Bolt. 3 is The spring 6 tends In i . l I I bier 11 is moved by the key1nto the POSl tion shown in F 1g. 2 the boltj3 may be Withdrawn and thedoor opened. To look the tumbler 11 in the position shown in full linesFig. l the hub 16 is rotated in sucha manner that the book 19 passesover the free end 20 of the tumbler 11 (see Fig. 1). In It-v 110Wimpossible to shift the tumbler ll 2 1 over the bolt and. if the hub 16is only to this position the bolt 3 is dead-locked.

be set from the inside of a roomzthe lock cannotbe opened by a keyinserted from the outside nor can the bolt belooked by the key. Only.the person inside the room can unlock the door and the proprietor-0f aproper lqey cannot use it.

The head 4; of the bolt3 is providedvvith a ribQO bevelled onboth sidesin such a manner that the look may beused for left hand doors as Well asfor right hand doors] The strike plate 21 is of angular cross-sectionand is provided With two cross slots 22, "23 tOlGCQlVQ. the Ilb 20 0116SlO l L lJQ/LH used for left hand doors an d the other for right handdoors.

All the'movin'g elements ofthe loek are' arranged in the same plane.They do not overlap and therefor the thickness of the lock is reduced toa minimum. The mortise to be made in the door style is narrow. lVhcn thehub 8 is Worn it may be replaced by the hub 16.

The new look as a Whole is of very simple construction, is readilyapplied, and operates in a very satisfactory manner to accomplish theend for which it is designed.

Various changes may be made Without dcparting froin the spirit of myinvention as claimed.

hat I Patent is:

Allock con'iprising in combination a case, a bolt rotatably mounted insaid case, a hub connected with handles adapted to rotate said bolt, ahand operatedv element rotatably mounted in the case and adapted to lockthe WlShltO secure by UQ S. Letters bolt, and a key operated tumbler,rotatably mounted in said caseand adapted to be positionedhehindthe boltin its locking position and having aprojection adapted to beengaged by ahook on the latch-hub for the purposeset forth.

FRIEDRICH LUTZMANN.

In. Wit 1.ess whereof I my signature.

